My current setup I have a RX360 > Res/pump > CPU I plan on getting a 7990 and getting a water block and was wondering on suggestions for my loop cause I'm thinking of doing another 360 rad but getting a EX360 and was wondering if it should be

RX360 > Res/Pump > CPU > EX360 > GPU or if I should just do a seperate loop specifically for the GPU.

Your current RX360 will sufficiently cool your 2600k and a 7970, if that's what you meant. You will want to add at least 120mm if you are actually talking about the 7990 when it comes out.

^This.

About the second loop, I would probably just make one loop with pumps in serial for redundancy when the time comes. I hear a GPU only loop is more trouble than it's worth, but don't have any firsthand experience in that matter (yet!)

The order in the loop really doesn't matter. If you can easily tube it between blocks, the block after the rad will see about a 1C water temperature difference. Not much to worry about unless it's an easy run

The order in the loop really doesn't matter. If you can easily tube it between blocks, the block after the rad will see about a 1C water temperature difference. Not much to worry about unless it's an easy run